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Vitamin B1 (Thiamine): Functions, Needs & Deficiency

Vitamin B1 (thiamine) is an essential water-soluble vitamin that the body needs for energy metabolism and proper functioning of the nervous system.

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Things worth knowing about "Vitamin B 1"

Vitamin B1 (thiamine) is an essential water-soluble vitamin that the body needs for energy metabolism and proper functioning of the nervous system.

What is Vitamin B1?

Vitamin B1, also known as thiamine or aneurine, is a water-soluble vitamin belonging to the B-vitamin family. It was the first B vitamin ever discovered and plays a fundamental role in carbohydrate and energy metabolism. Since the human body cannot synthesize thiamine on its own, it must be obtained regularly through diet.

Biological Functions

Vitamin B1 acts as a coenzyme in the form of thiamine pyrophosphate (TPP) and is involved in several essential metabolic processes:

Converting carbohydrates into usable energy (ATP production)
Supporting the function of nerve and muscle cells
Participating in the breakdown of sugars (glycolysis) and amino acids
Facilitating the transmission of nerve impulses
Protecting the nervous system from oxidative stress

Dietary Sources

Vitamin B1 is found in a wide variety of foods. The richest sources include:

Whole grain products (e.g., oats, whole grain bread)
Legumes (e.g., lentils, peas, beans)
Pork and organ meats
Nuts and seeds (e.g., sunflower seeds)
Yeast and yeast extracts
Potatoes and vegetables

Note: Thiamine is heat-sensitive and can be partially destroyed by prolonged cooking or food processing.

Recommended Daily Intake

Official recommendations for the daily intake of Vitamin B1 vary depending on age, sex, and life circumstances. According to the World Health Organization (WHO) and major nutrition authorities, the following reference values apply:

Men (19–64 years): 1.2 mg per day
Women (19–64 years): 1.0 mg per day
Pregnant women: 1.2 mg per day
Breastfeeding women: 1.3 mg per day
Children: 0.2–1.1 mg per day (depending on age)

Deficiency

A Vitamin B1 deficiency (thiamine deficiency) can lead to a range of health problems. Those at highest risk include people with poor dietary habits, heavy alcohol consumption, gastrointestinal disorders, or increased nutritional needs (e.g., during pregnancy).

Common Symptoms of Deficiency

Fatigue, weakness, and irritability
Difficulty concentrating and memory problems
Tingling or numbness in the hands and feet (neuropathy)
Loss of appetite and weight loss

Severe Deficiency Diseases

Beriberi: A classic thiamine deficiency disease affecting the nervous and cardiovascular systems. It presents in a dry form (neuropathy) and a wet form (with heart failure and edema).
Wernicke encephalopathy: A serious neurological condition frequently seen in individuals with alcohol dependency, characterized by confusion, abnormal eye movements, and impaired balance.
Korsakoff syndrome: A chronic condition following Wernicke encephalopathy, marked by severe memory loss and cognitive impairment.

Diagnosis

Thiamine deficiency is typically identified through blood tests. The most common diagnostic marker is the measurement of thiamine pyrophosphate activity in red blood cells, or thiamine levels in whole blood. Clinical signs and dietary history also contribute to the overall assessment.

Supplementation and Treatment

When a deficiency is confirmed, Vitamin B1 can be replenished through dietary supplements or, in severe cases, via intravenous infusion. Thiamine supplements are generally well tolerated, as excess thiamine is excreted by the kidneys. Toxicity from oral intake is extremely rare due to limited intestinal absorption at high doses.

Interactions

Alcohol significantly inhibits the absorption and utilization of thiamine.
Certain foods (e.g., raw fish) contain thiaminases, enzymes that break down thiamine.
Very high consumption of coffee and tea may slightly reduce thiamine absorption.
Diuretics (water pills) can increase the urinary excretion of thiamine.

References

World Health Organization (WHO): Thiamine deficiency and its prevention and control in major emergencies. WHO/NHD/99.13, Geneva, 1999.
Lonsdale D. – A review of the biochemistry, metabolism and clinical benefits of thiamin(e) and its derivatives. Evidence-Based Complementary and Alternative Medicine, 2006.
Institute of Medicine (US): Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. National Academies Press, Washington DC, 1998.

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